Tomcat load balancing is achieved by designating a PAS for OpenEdge instance that does nothing but refer requests from a Web server to instances that can process them. Tomcat is built into PAS for OpenEdge. The following figure illustrates this load balancing configuration.
Some advantages of this configuration, compared to
Apache proxy host load balancing, are:
The PAS for OpenEdge instance that is designated as a load balancer (
lb in the figure above) is aware of the runtime status of each instance in its group and will not forward a request to an instance that is down.
Tomcat load balancing allows you to configure a PAS for OpenEdge instance as as a monitor of runtime statistics for each instance in the load balancing group (the
status instance in the figure above).
